html - javascript marginLeft on image onload not working in Chrome -


i have gallery resizes image javascript in order keep original aspect ratio. document structure : stylesheet considering particular object following :

 #thepicture {position:absolute;left:50%;height:100%;max-width:100%;}

then php build list of images menu,and recent 1 sets #thepicture manipulated following javascript

 function keepratio() {  var height = document.getelementbyid('thepicture').height;  var width = document.getelementbyid('thepicture').width;  var origheight = document.getelementbyid('thepicture').naturalheight;  var origwidth = document.getelementbyid('thepicture').naturalwidth;  var ratio = origwidth / origheight;  document.getelementbyid('thepicture').width = height * ratio;  document.getelementbyid('thepicture').style.marginleft = - width/2;  }

i call function once @ instance of window.onload , @ every instance of selecting new image viewed , on ...thepicture').onload

now problem im having occurs in chrome : first there isnt image set thepicture (which made javascript function , because initial image in place after php constructed entire page.),on first click in menu select new image , nothing happens , on second click image appears out of intended position , , on third click , negative margin gets calculated,moving image in place.my page works fine in opera , mozilla.


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